Jack Y. Dea

Naval Information Warfare Center Pacific

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Co-Authors

Wolfgang-Martin Boerner

University of Illinois Chicago

Peder M. Hansen

Naval Information Warfare Center Pacific

P.A. Mosier-Boss

Global Aerospace (United States)

L. Sheiba

University of Bristol

Wolfgang‐M. Boerner

University of Illinois Chicago

Frank E. Gordon

Naval Information Warfare Center Pacific

E. A. Rauscher

University of Liverpool

S. Szpak

Naval Information Warfare Center Pacific

Charles I. Richman

Dan W. Urry

University of Alabama at Birmingham

Cooperative Institutions

Naval Information Warfare Center Pacific

Naval Information Warfare Systems Command

Arizona State University

NOAA National Centers for Coastal Ocean Science

Diagnostics Research Group

Ludwig-Maximilians-Universität München

University of Illinois Chicago

University of Illinois Urbana-Champaign

University of Bristol

Ocean Medical Center

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Constant-output atomizer. [Inhalation therapy and aerosol research

Jack Y. Dea

Constant (computer programming)

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Observations of ELF (extremely low frequency) signatures arising from space vehicle disturbances of the ionosphere

Canadian Journal of Physics (1991)

Jack Y. Dea William Van Bise E. A. Rauscher Wolfgang‐M. Boerner

We report on observations of extremely low-frequency (ELF) signatures during exit or reentry of space vehicles through the ionosphere. The two modes regularly observed gave signals that peaked at 5.6 and 11.2 Hz. The evidence points to the lower ionosphere, i.e., the D- and E-layers, as the generator of these signals. The measurements were performed using ground-based multiturn coil sensors located in Reno and San Diego. The nature of these signals is unclear at present but it is surmised that we are detecting either the evanescent fields of hydromagnetic waves traveling in the ionosphere or the oscillating geomagnetic field associated with these hydromagnetic waves.

Extremely low frequency

Schumann resonances

Space physics

10.1139/p91-151

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Citations (3)

Underwater impulsive acoustical generation from steam bubbles

The Journal of the Acoustical Society of America (1997)

Jack Y. Dea

One of the most common techniques to generate impulsive sound underwater is through the use of sparkers. The sound is generated through high-voltage arcing across two electrodes. Research at NCCOSC, RDT&E division has shown that modest sound levels can be produced from electrodes operated at nonarcing voltages. In this mode the main products in the electrode spacing are steam bubbles. The expansion and subsequent collapse of a single steam bubble is what generates the underwater sound. The advantages to the use of nonarcing electrodes are longer electrode life, greater reproduciblity, and the use of light-weight components. The disadvantages include lower electroacoustical conversion efficiency and lower electrical power input. The electroacoustical conversion efficiencies measured reached 0.7%. Extrapolation of efficiency data show that 1% or better efficiency may be achievable. A high-speed imaging was developed to capture the history of events in the electrode spacing. Images of various bubble events are shown and interpreted. [Work supported by ONR.]

Underwater explosion

Electric arc

10.1121/1.420502

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Improved Atomizer Resists Clogging

NASA Tech Briefs (1983)

Jack Y. Dea

Improved constant-output atomizer has conical orifice that permits air to sweep out all liquid thoroughly and prevent any buildup of liquid or dissolved solids. Capillary groove guides liquid to gas jet. Simple new design eliminates clogging.

Clogging

Groove (engineering)

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Sensing of ELF signatures arising from space vehicle disturbances of the ionosphere

In AGARD (1992)

Jack Y. Dea William Vanbise E. A. Rauscher Wolfgang-Martin Boerner

Space vehicle

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Evidence for the Induction of Nuclear Activity in Polarized Pd/H–H2O System

Stanislaw Szpak Jack Y. Dea

In cells employing cathodes prepared by the co-deposition process, the polarized Pd/D–D2O system becomes nuclear active when the concentration of deuterium, expressed as D/Pd atomic ratio, is equal to or greater than one. In contrast, to activate the polarized Pd/H–H2O system, action of an external magnetic field, modulation of cell current or both, are required. Evidence for the nuclear active state in the Pd/H–H2O system namely deuterium production, particle emission and catastrophic thermal event, is presented. © 2012 ISCMNS. All rights reserved.

10.70923/001c.72202

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Technology advances in VLF/LF atmospheric noise generation and characterization far laboratory use

Paul A. Singer Jack Y. Dea K.J. Cain T. Schlösser

Very Low Frequency (VLF)/Low Frequency (LF) communications represent the backbone of the U.S. Navy's communications from command authorities to strategic forces. This paper covers the historical development of VLF/LF simulation and atmospheric noise characterization to support laboratory tests. Emphasis is placed on the current level of development.< >

Characterization

Emphasis (telecommunications)

10.1109/imtc.1994.351910

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Electrically small plate antenna that operates at HF

2006 IEEE Antennas and Propagation Society International Symposium (2005)

Jack Y. Dea

A new antenna to replace existing shipboard high-frequency (HF) receive antennas has been designed, manufactured, installed, and successfully tested on several ships by SPAWAR Systems Center San Diego. The mast-clamp current probe (MCCP) antenna is a ferrite-core current probe device which is designed to couple to existing ship structures, especially the mast, to form an antenna to receive radio frequencies (RF) in the HF (2-30 MHz) frequency range. The same technology that was used to develop the receive MCCP is currently being applied to the development of an HF transmit MCCP. Design issues addressed during the transmit probe development include impedance matching to the structure over a broad range of frequencies, identification of low loss magnetic core materials capable of withstanding heat generated from multiple 1 kW transmitters, identification of low loss magnetic core material that meet linearity requirements, size, weight, and cost of the transmit probe that will achieve acceptable transmit performance

Ferrite core

Antenna tuner

Linearity

10.1109/aps.2005.1551468

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Steady generation of aerosols with an improved constant output atomizer

Jack Y. Dea U. Katz

It is common practice to generate laboratory aerosols of soluble materials with pneumatic atomizers. In a typical device, a solution of the substance to be aerosolized is injected into a jet of air and the liquid is broken up into very small droplets. After forced evaporation, a dry aerosol of the solute is produced. A number of commercially available devices were tested, and despite differences in design, all the atomizers tested suffered from short- and/or long-term fluctuations of their output particle number concentrations. The mechanisms responsible for atomizer instabilities are discussed and methods for alleviating these problems are considered.

Aerosolization

Particle (ecology)

Constant (computer programming)

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Experimental Tests of Nucleation Theory

Jack Y. Dea

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